Britney Spears is still not that innocent!

Breaking Celebrity News has exclusively obtained a copy of a sex tape starring the 35-year-old mother of two, and according to a source close to the reigning pop princess, the scandal could send her over the edge — again!

In the footage, which Breaking Celebrity News has decided not to publish, Spears is topless while smoking what looks like a joint and gyrating on top of a secret lover.

According to an insider, Spears — who's recently fallen head-over-heels in love with a muc